lim cos2x/(sinx-cosx) x→π/4 求函数的极限
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lim cos2x/(sinx-cosx) x→π/4 求函数的极限
lim cos2x/(sinx-cosx) x→π/4 求函数的极限
lim cos2x/(sinx-cosx) x→π/4 求函数的极限
lim cos2x/(sinx-cosx)
=lim (cosx+sinx)(cosx-sinx)/(sinx-cosx)
=lim- (cosx+sinx)
=-√2
lim(x→π/4)cos2x/(sinx-cosx) 分子,分母都趋于0, 则可以用罗比达法则,分别对分子 ,分母求导
lim(x→π/4)cos2x/(sinx-cosx)
limx趋于π/4-2sin2x/(cosx+sinx )
= - 根号2
lim (cosx-sinx)/cos2x x→π/4
化简(cos2x/sinx+cosx)-(cos2x/sinx-cosx)
sinx×cos2x-sin2x×cosx
化简:sinx×cosx×cos2x
为什么cos2x=cosx*cosx-sinx*sinx
求lim(x→π/4) (sin2x-cos2x-1)/(cosx-sinx)的极限
lim cos2x/(sinx-cosx) x→π/4 求函数的极限
lim x→0 (1-cosx√cos2x√cos3x)/(e^x+1)sinx dx
∫cos2x/(sinx+cosx)dx
cos2x/sinx+cosx + 2sinx=
y=cos2x+sinx(sinx+cosx) 化简
怎么证明cos2x/1-sin2x = cosx+sinx/cosx-sinx
为什么cos2X=(cosX)^2-(sinX)^2
cos2x/(cosx-sinx)的原函数是什么
cos2x+cosx=0,则sin2x+sinx
化简:(sinx+sin2x)/(1+cosx+cos2x)
化简:3.sinx·cosx·cos2x
为什么cos2x=cosx^2-sinx^2